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Cryptanalysis of SPEED (Extended Abstract)

C. Hall, J. Kelsey, B. Schneier and D. Wagner

Financial Cryptography '98, Springer-Verlag, 1998, pp. 309-310.

ABSTRACT: The cipher family SPEED (and an associated hashing mode) was recently
proposed in Financial Cryptography '97. In cryptanalyzing the cipher
we found several troubling potential weaknesses. Next, we were able to
efficiently break the SPEED hashing mode using differential related-key
techniques. Finally, we examined differential attacks against the 48-round
version of SPEED. These results raise some significant questions about the
security of the SPEED design.